.box {
  position: fixed;
  left: 0;
  top: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.5);
}
.text {
  width: 300px;
  height: 200px;
  background-color: white;
  text-align: center;
  line-height: 200px;
  margin: 200px auto;
}
